For example, here the CD drive is the D drive
Restart the computer and the problem has been fixed.
However, in practice, it is not always possible to apply the above method, such as the computer having an error with no CD drive. If that is the case, please start the browser from Task Manager, preferably Mozilla Firefox or Google Chrome, do not use Internet Explorer because there is an error. Then, download the file iertutil.dll here, the Save as option may not work, so save it to the default location, then use the Command Prompt to copy the file to the System32 system folder as above.
Another way can be applied is to use the Windows 7 installation disk, then boot into Recovery mode, connect the USB drive containing the iertutil.dll file and copy to the System32 folder in the above way. Good luck!